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You must comprehend the distinct menstrual cycle phases in order to calculate your safe days.
1: The proliferative phase or the follicular phase
Before ovulation, the follicular phase takes place. The follicles in the ovary begin to mature during this phase. Ovulation marks the conclusion of this period. Estradiol is the hormone in charge at this stage, and follicle-stimulating hormone (FSH) is released.
2: The Ovulation Stage 2
An ovarian follicle that has reached maturity ruptures and releases an ovum during the ovulation phase (also known as an egg). The ovulation phase is the term used to describe the moments right before and after ovulation. When a woman is ovulating, she may become pregnant.
3. The Secretory Phase and Luteal Phase
The menstrual cycle's luteal phase is its final stage. It begins with the formation of the corpus luteum and ends with either pregnancy or the corpus luteum degenerating. A transitory endocrine structure called the corpus luteum aids in oestrogen and progestogen production. Oestrogen and progestogen are required by the body to maintain the endometrium, the uterus' inner lining. The number of safe days a woman has following her period depends on the sperm and egg life spans. If the menstrual cycle is average in length, ovulation often occurs on day 14 of the cycle (28 days).
Ovulation can happen between the 12th and the 19th day of the cycle, depending on the individual woman. A sperm typically survives in the reproductive system for 3 to 5 days. Therefore, if unprotected sex is had five days prior to ovulation, it is possible to become pregnant. The egg has a very brief life span of about 24 hours. The egg will expire if fertilisation does not take place within that time range.
1: The proliferative phase or the follicular phase
Before ovulation, the follicular phase takes place. The follicles in the ovary begin to mature during this phase. Ovulation marks the conclusion of this period. Estradiol is the hormone in charge at this stage, and follicle-stimulating hormone (FSH) is released.
2: The Ovulation Stage 2
An ovarian follicle that has reached maturity ruptures and releases an ovum during the ovulation phase (also known as an egg). The ovulation phase is the term used to describe the moments right before and after ovulation. When a woman is ovulating, she may become pregnant.
3. The Secretory Phase and Luteal Phase
The menstrual cycle's luteal phase is its final stage. It begins with the formation of the corpus luteum and ends with either pregnancy or the corpus luteum degenerating. A transitory endocrine structure called the corpus luteum aids in oestrogen and progestogen production. Oestrogen and progestogen are required by the body to maintain the endometrium, the uterus' inner lining. The number of safe days a woman has following her period depends on the sperm and egg life spans. If the menstrual cycle is average in length, ovulation often occurs on day 14 of the cycle (28 days).
Ovulation can happen between the 12th and the 19th day of the cycle, depending on the individual woman. A sperm typically survives in the reproductive system for 3 to 5 days. Therefore, if unprotected sex is had five days prior to ovulation, it is possible to become pregnant. The egg has a very brief life span of about 24 hours. The egg will expire if fertilisation does not take place within that time range.
| Safe times using the calendar method | |||||||||
| Sunday | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | |||
| Start of period 1 | 2 | 3 | 4 | 5 | 6 | 7 | Safe Days | ||
| 8 | 9 | 10 | 11 | 12 | 13 | 14 | Unsafe days | ||
| 15 | 16 | 17 | 18 | 19 | 20 | 21 | Unsafe Days | ||
| 22 | 23 | 24 | 25 | 26 | 27 | 28 | Safe Days | ||
| Start of period 29 | 30 | 1 | 2 | 3 | 4 | 5 | Safe Days |